When was the Ninth General Conference on Weights and Measures decided to abandon centigrade and used Celsius Instead?  a. 1950  b. 1936  c. 1957  d. 1948

When was the Ninth General Conference on Weights and Measures decided to abandon centigrade and used Celsius Instead?  a. 1950  b. 1936  c. 1957  d. 1948
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